Peer pressure

My friend Randy was visiting this past weekend and came to Sierra's performance at my student recital. A few days later I got a note from Randy with a story from the recital reception...... her telling of the anecdote below:

Ok, it's funnier in person but at least you can imagine Sierra's inflection. So, she filled her plate at the reception with cakes and brownies, etc., and I sadly took grapes and strawberries. We sat down across from each other.

Sierra: Why don't you have any cake?
Randy: I don't eat it.
S: Why?
R: For my health
S: Well, this little brownie (Pointing to the round mini muffin type brownie) is really DEE-LI-ICIOUS and it is SOOOOOO SMALL. Get one.
R: Hmmm, well, can you go break into that long line and get one for me?
S: Yes
.........
S: Here it is
R: Thank you. (I place it on my plate but don't touch it.)
S: EAT IT
R: Ok. (I take a tiny bite....she seems satisfied) I pick up my plate and leave and dump it in the garbage.

Now, I have stood up to lots of adults pressuring me to eat stuff and I hold up well. With Sierra, when she said EAT IT....what can you do?